The first close-up of the "flip-flop" phenomenon in a single star

Details The first close-up of the "flip-flop" phenomenon in a single star The first close-up of the "flip-flop" phenomenon in a single star

2001-10-23

arxiv.org/abs/astro-ph/0110517v1

Astronomy and Astrophysics

Astrophysics

4 pages, accepted by A&A Letters

Scientific paper

10.1051/0004-6361:20011359

We present temperature maps of the active late-type giant FK Com which exhibit the first imagining record of the ``flip-flop'' phenomenon in a single star. The phenomenon, in which the main part of the spot activity shifts 180 degrees in longitude, discovered a decade ago in FK Com, was reported later also in a number of RS CVn binaries and a single young dwarf. With the surface images obtained right before and after the ``flip-flop'', we clearly show that the ``flip-flop'' phenomenon in FK Com is caused by changing the relative strengths of the spot groups at the two active longitudes, with no actual spot movements across the stellar surface, i.e. exactly as it happens in other active stars.

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